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xgql-introspect.js
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xgql-introspect.js
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#!/usr/bin/env node
const nearley = require("nearley");
const graphqlGrammar = require("./graphql_grammar");
const fs = require("fs").promises;
const toIntrospection = require("./json-to-introspection");
const program = require("commander");
program
.description(
"Simulates a basic introspection query against the schema and outputs as json"
)
.option(
"-o --output <path>",
"Sends the resulting file to the given file instead of stdout"
)
.action(function () {
run(process.argv.slice(2));
})
.usage("[options] <path>")
.parse(process.argv);
async function run(args) {
if (args.length != 1) {
console.log("Please specify exactly one graphQL schema file");
process.exit(1);
}
const filename = args[0];
const parser = new nearley.Parser(
nearley.Grammar.fromCompiled(graphqlGrammar)
);
try {
const schema = await fs.readFile(filename, "utf8");
const parsed = parser.feed(schema);
const result = JSON.stringify(toIntrospection(parsed.results[0]), null, 2);
if (program.output) {
await fs.writeFile(program.output, result, "utf8");
} else {
console.log(result);
}
} catch (err) {
let message = err.message;
const idx = message.lastIndexOf("Unexpected input");
if (idx >= 0) {
message = message.substring(0, idx);
}
console.log(message);
process.exit(1);
}
}